Check the box for if you are moving between major versions (e.g., EMUI 11 to EMUI 12).

The official HiSuite should now "see" the version you entered in the Proxy as an available official update. Click and wait for the download to finish. Common Troubleshooting

Normally, HiSuite only allows you to install "approved" firmware that Huawei’s servers push to your specific Serial Number. HiSuite Proxy tricks the official software into thinking that a firmware package you’ve selected (even if it isn't officially "authorized" for your device yet) is the correct, official update. Key Features of v3.1.3:

This usually means the firmware you chose is not compatible with your device's current regional ID (Cust). Double-check that your firmware matches your region.

Modifying device firmware carries risks. Ensure you follow specific guides for your exact device model on forums like XDA Developers.